<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>搜索框</title>
</head>
<body>

    <input type="text" placeholder="请输入你要搜索的内容">
    <button>搜索</button>
    
</body>

<style>
    input
    {
        border: 2px solid orange;
        width: 200px;
        height: 30px;
        outline: none;
    }

    button
    {
        border: none;
        background-color: orange;
        width: 80px;
        height: 35px;
        color: white;
    }
</style>

</html>